/*
 * Copyright (c) 2023 DuckDuckGo
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.duckduckgo.sync.settings.impl

import androidx.room.*
import kotlinx.coroutines.flow.*

@Dao
interface SettingsSyncMetadataDao {

    @Query("select * from settings_sync_meta where `key` = :key")
    fun get(key: String): SettingsSyncMetadataEntity?

    @Query("select * from settings_sync_meta")
    fun getAllObservable(): Flow<List<SettingsSyncMetadataEntity>>

    @Insert(onConflict = OnConflictStrategy.REPLACE)
    fun addOrUpdate(settingsSyncMetadataEntity: SettingsSyncMetadataEntity): Long

    @Query("select * from settings_sync_meta where modified_at > :since")
    fun getChangesSince(since: String): List<SettingsSyncMetadataEntity>

    @Query("Delete from settings_sync_meta")
    fun removeAll()

    @Transaction
    fun initialize(keys: List<String>) {
        removeAll()
        keys.map { SettingsSyncMetadataEntity(key = it, deleted_at = null, modified_at = SyncDateProvider.now()) }
            .forEach { addOrUpdate(it) }
    }
}
